[Mac] Disable resizing of the hung renderer dialog....

chrome/app/nibs/HungRendererDialog.xib

 <?xml version="1.0" encoding="UTF-8"?>
 <archive type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="7.03">
         <data>
                 <int key="IBDocument.SystemTarget">1050</int>
                 <string key="IBDocument.SystemVersion">9J61</string>
                 <string key="IBDocument.InterfaceBuilderVersion">677</string>
                 <string key="IBDocument.AppKitVersion">949.46</string>
                 <string key="IBDocument.HIToolboxVersion">353.00</string>
                 <object class="NSMutableArray" key="IBDocument.EditedObjectIDs">
                         <bool key="EncodedWithXMLCoder">YES</bool>
@@ skipping 17 matching lines @@
                         <object class="NSCustomObject" id="1001">
                                 <string key="NSClassName">HungRendererController</string>
                         </object>
                         <object class="NSCustomObject" id="1003">
                                 <string key="NSClassName">FirstResponder</string>
                         </object>
                         <object class="NSCustomObject" id="1004">
                                 <string key="NSClassName">NSApplication</string>
                         </object>
                         <object class="NSWindowTemplate" id="1005">
-                                <int key="NSWindowStyleMask">9</int>
+                                <int key="NSWindowStyleMask">1</int>
                                 <int key="NSWindowBacking">2</int>
                                 <string key="NSWindowRect">{{196, 264}, {480, 246}}</string>
                                 <int key="NSWTFlags">536870912</int>
                                 <string key="NSWindowTitle"/>
                                 <string key="NSWindowClass">NSWindow</string>
                                 <nil key="NSViewClass"/>
                                 <string key="NSWindowContentMaxSize">{3.40282e+38, 3.40282e+38}</string>
                                 <object class="NSView" key="NSWindowView" id="1006">
                                         <reference key="NSNextResponder"/>
                                         <int key="NSvFlags">256</int>
@@ skipping 606 matching lines @@
                                                 <string key="minorKey">browser/cocoa/tab_strip_model_observer_bridge.h</string>
                                         </object>
                                 </object>
                         </object>
                 </object>
                 <int key="IBDocument.localizationMode">0</int>
                 <string key="IBDocument.LastKnownRelativeProjectPath">../../../chrome.xcodeproj</string>
                 <int key="IBDocument.defaultPropertyAccessControl">3</int>
         </data>
 </archive>